In a prepared statement, Target Spokesman Lee Henderson told CBS News those particular models were not intended to be used by children under 14, which means certain lead restrictions don't apply.

"The Consumer Product Safety Commission (CPSC) has reviewed and explicitly defined fidget spinners as 'general use products.' They are not defined by the CPSC as toys," Henderson said.

He went on to say that Target has received the lead testing results. Henderson noted that their product safety team reviewed the findings and determined that the products were safe to stay on the shelves.

"The two fidget spinners cited in their letter are clearly marked on the package as 'appropriate for customers ages 14 and older,' and are not marketed to children," he continued. "As a result, the fidget spinners identified are not regulated as toys or children's products and are not required to meet children's product standards."

Bulls-I-Toys, the manufacturer of the fidget spinners in question, said in a letter to US PIRG that "there are no mandatory CPSC requirements for it" because the packaging makes it clear that the item should not be used by children of a certain age.

Still, officials at the US PIRG believe something has to be done to avoid exposing children and others to the toxins found in the fidget spinners.